EP1799997A1 - Fuel injection valve - Google Patents
Fuel injection valveInfo
- Publication number
- EP1799997A1 EP1799997A1 EP05804894A EP05804894A EP1799997A1 EP 1799997 A1 EP1799997 A1 EP 1799997A1 EP 05804894 A EP05804894 A EP 05804894A EP 05804894 A EP05804894 A EP 05804894A EP 1799997 A1 EP1799997 A1 EP 1799997A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outlet opening
- fuel injection
- valve seat
- opening
- injection valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
- F02M61/1853—Orifice plates
Definitions
- the invention relates to a fuel injection valve according to the preamble of the main claim.
- DE 4221 185 A1 already discloses a fuel injection valve which has a perforated disc with a plurality of outlet openings downstream of a fixed valve seat.
- the perforated disc is initially provided with at least one outlet opening by punching, which runs parallel to the valve longitudinal axis. Then, the perforated disc is plastically deformed in its central region, which has the outlet openings, by deep drawing, so that the outlet openings extend inclined relative to the longitudinal axis of the valve and engage in
- a fuel injection valve is already known in which a perforated disc with a plurality of outlet openings is provided downstream of the valve seat.
- an inlet opening with a larger diameter is formed between an outlet opening in the valve seat body and the perforated disc, which forms an annular inflow cavity for the outlet openings.
- the outlet openings of the perforated disc are in direct contact with the inflow opening and the annular inflow cavity Flow connection and are covered by the upper boundary of the Zuströmöffiiung. In other words, there is a complete offset from the outlet opening and the outlet openings defining the inlet of the inflow opening.
- the inflow opening defining the S-shaped course of the flow has a continuously constant height.
- the fuel injection valve according to the invention with the characterizing features of the main claim has the advantage that in a simple manner uniform atomization of the fuel is achieved, with a particularly high quality of preparation and Zerstäubungsgüte is achieved with very small fuel droplets.
- This is advantageously achieved by providing in the valve seat body upstream of the outlet openings an inflow opening with an annular inflow cavity which is larger than an outlet opening downstream of the valve seat. In this way, the valve seat body already assumes the function of influencing the flow in the perforated disc.
- the formation of the inflow opening achieves an S-blow in the flow for atomization improvement of the fuel, since the valve-seat body with the upper boundary of the inflow opening covers the outlet openings of the perforated disk. Due to the constant reduction of the height of the inflow opening from the outlet opening to the outlet openings in the perforated disk, the flow in the inflow opening is advantageously accelerated to promote atomization.
- an inflatable passage area above the at least one outlet opening in the upstream of the perforated disk Anströmlohlraum is smaller than the surface of the inlet plane of the outlet opening, wherein the passage area calculated as the product of the circumference of the outlet opening in the area its inlet level and the free height in the inflow cavity of the inflow opening.
- perforated disks By means of electrodeposition, perforated disks can be produced in a reproducible manner in an extremely precise and cost-effective manner in very large numbers simultaneously. In addition, this production allows an extremely large design freedom, since the contours of the openings in the perforated disc can be selected freely.
- Figure 2 shows the detail II in Figure 1 with the inventively designed Anströmhohlraum in an enlarged view and Figure 3 shows the same section II with a second embodiment.
- FIG. 1 is shown as an embodiment, a valve in the form of an injection valve for fuel injection systems of mixture-compression spark-ignition internal combustion engines partially.
- the injection valve has a tubular valve seat carrier 1, which only schematically indicates a part of a valve housing and in which a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2.
- a longitudinal opening 3 is formed concentrically to a valve longitudinal axis 2.
- Spherical valve closing body 7 on whose circumference, for example, five flats 8 are provided for flowing past the fuel, is firmly connected.
- the actuation of the injection valve takes place in a known manner, for example electromagnetically.
- a schematically indicated electromagnetic circuit with a solenoid 10, an armature 11 and a core 12.
- the armature 11 is connected to the valve closing body. 7 opposite end of the valve needle 5 by eg a trained by a laser weld and aligned with the core 12.
- valve seat body 16 In the downstream end of the valve seat carrier 1 is a valve seat body 16, e.g. tightly assembled by welding. At its lower end face 17 facing away from the valve closing body 7, the valve seat body 16 is stepped, with a recess 20 being provided in a central area around the valve longitudinal axis 2, in which a flat, e.g. single-layer perforated disc 23 is introduced.
- the perforated disc 23 has at least one, but ideally two to forty outlet openings 24.
- an inflow opening 19 Upstream of the recess 20 and thus of the outlet openings 24 of the perforated disc 23, an inflow opening 19 is provided in the valve seat body 16, via which the individual outlet openings 24 are flown.
- the inflow opening 19 has a diameter which is greater than the opening width of an outlet opening 27 in the valve seat body 16, from which the fuel flows into the inflow opening 19 and ultimately into the outlet openings 24.
- the inflow opening 19 is designed, in particular, in the immediate inflow region of the outlet openings 24 with a special geometry.
- Outlet opening 27 larger diameter annular region of the inflow opening 19 is shown enlarged in Figures 2 and 3, explained in more detail with reference to these figures and is referred to below as Anströmhohlraum 26.
- valve seat body 16 and perforated disc 23 are effected for example by a circumferential and dense, formed by a laser weld 25, which is placed outside of the inflow opening 19. After attachment of the perforated disc 23, this is sunk in the recess 20 opposite the end face 17th
- the insertion depth of the valve seat body 16 with the perforated disc 23 in the L Lucassöfmung 3 determines the size of the stroke of the valve needle 5, since the one end position of the valve needle 5 with non-energized solenoid 10 by the system of the valve closing body 7 at a downstream conically tapered valve seat surface 29 of the valve seat body 16 is set.
- the other end position of the valve needle 5 is fixed in the excited magnet coil 10, for example, by the system of the armature 11 to the core 12. The path between these two end positions of the valve needle 5 thus represents the hub.
- the perforated disk 23 may be made e.g. also be constructed in two layers with two functional levels one above the other.
- the outlet openings 24 of the perforated disc 23 are in direct flow communication with the inflow opening 19 and the annular inflow cavity 26 and are thereby covered by the upper boundary of the inflow opening 19. In other words, a complete offset of the inlet of the inflow opening 19 defining
- the perforated disk 23 is produced, for example, by means of galvanic metal deposition, wherein the production of a single-layer perforated disk 23 is advantageous, in particular with the technique of lateral overgrowth.
- a punching technical production of the perforated disc 23 is just as conceivable.
- the Auslassöffiiache 24 ideally have a trumpet-shaped or lavaldüsen shame contour. From the cross-section, the Auslassöffiiache 24 may for example have a circular, oval or polygonal shape.
- FIG. 2 shows an enlarged detail II in FIG. 1 for clarifying the geometry of the inflow opening 19 or the inflow cavity 26 between the boundary surface 30 of the valve seat body 16 and the perforated disc 23.
- the valve seat body 16 is configured in such a way that the boundary surface 30 of the outlet opening 27 (FIG. Diameter Dl) starting in the direction of the perforated disc 23 in a first portion 30a radially outwardly inclined continuously inclined up to a diameter D2.
- a step or a bend is provided in the boundary surface 30, from which a second section 30b of the inflow opening 19 follows radially outwards, which is bounded largely perpendicular to the valve longitudinal axis 2 by the boundary surface 30.
- the second section 30b thus has a substantially constant height.
- the transition from the first to the second section of the boundary surface 30 lies directly in front of the outlet openings 24, directly at the boundary edges of the outlet openings 24 or above the outlet openings 24. This leads to the fact that above a perpendicular to the valve longitudinal axis 2 extending entrance plane 31 of At least one outlet opening 24 is present only a small amount of Anströmhohlraums 26 and the flow on the way from the
- Outlet opening 27 is accelerated steadily promoting sputtering starting to the outlet openings 24.
- the diameter of the entire inflow opening 19 including a relative to the outlet openings 24 radially outward back space R is denoted by D3.
- an imaginary flowable vertical passage area above the outlet opening 24 in the on-axis cavity 26, calculated as the product of the circumference of the outlet opening 24 in the region of its inlet plane 31 and the free height in the on-axis cavity 26, is smaller than the area of the Entry level 31 of the outlet opening 24. The highest atomization quality is achieved when this ratio is maintained at all outlet openings 24 of the perforated disc 23.
- the imaginary passage area is the smallest, volume-measuring cross-section in the flow path.
- the entry level 31 of the outlet opening 24, the flow entering it provides more cross-sectional area than is needed for the flow rate predated by the passage area 32.
- the flow is thus completely detached from the wall of the outlet opening 24 in the entry plane 31.
- the horizontal velocity components of the flow entering the inlet plane 31 are thus not hindered by the wall of the outlet opening 24 at the entry plane 31, so that the fuel jet when leaving the outlet opening 24 has the full intensity of the horizontal components generated in the onflow cavity 26 and therefore with maximum atomization fan out.
- FIG. 3 shows a further inflow cavity 26 designed according to the invention as an annular region of the inflow opening 19 in an enlarged representation in a section comparable to FIG.
- the boundary surface 30 of the valve seat body 16 extends from the outlet opening 27 parabolic, convex, said first portion 30a of the boundary surface 30 above the at least one outlet opening 24 flowing in the second substantially perpendicular to the valve longitudinal axis 2 extending, a constant height portion 30b passes.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004049281A DE102004049281A1 (en) | 2004-10-09 | 2004-10-09 | Fuel injector |
PCT/EP2005/054695 WO2006040244A1 (en) | 2004-10-09 | 2005-09-20 | Fuel injection valve |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1799997A1 true EP1799997A1 (en) | 2007-06-27 |
EP1799997B1 EP1799997B1 (en) | 2009-11-18 |
Family
ID=35355040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05804894A Expired - Fee Related EP1799997B1 (en) | 2004-10-09 | 2005-09-20 | Fuel injection valve |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090032623A1 (en) |
EP (1) | EP1799997B1 (en) |
JP (1) | JP2008516135A (en) |
CN (1) | CN100572794C (en) |
DE (2) | DE102004049281A1 (en) |
WO (1) | WO2006040244A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2189224A1 (en) * | 2008-11-22 | 2010-05-26 | Grundfos Management A/S | Jet |
CN103223390A (en) * | 2013-04-02 | 2013-07-31 | 张建辉 | Piezoceramic ultrasonic atomizer |
CN106000677B (en) * | 2016-07-15 | 2022-05-24 | 陕西华远动力科技有限公司 | Fuel oil preatomizer, fuel oil atomization joint and manufacturing method of fuel oil preatomizer |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19724075A1 (en) * | 1997-06-07 | 1998-12-10 | Bosch Gmbh Robert | Method for producing a perforated disk for an injection valve and perforated disk for an injection valve and injection valve |
US6644565B2 (en) * | 1998-10-15 | 2003-11-11 | Robert Bosch Gmbh | Fuel injection nozzle for self-igniting internal combustion engines |
JP2000199468A (en) * | 1998-12-28 | 2000-07-18 | Moritex Corp | Fuel injection system and fuel injection method of internal combustion engine |
JP2001027169A (en) * | 1999-07-15 | 2001-01-30 | Unisia Jecs Corp | Fuel injection valve |
DE19937961A1 (en) * | 1999-08-11 | 2001-02-15 | Bosch Gmbh Robert | Fuel injection valve and method for producing outlet openings on valves |
JP4097056B2 (en) * | 2000-03-17 | 2008-06-04 | 株式会社デンソー | Fuel injection valve |
US6742727B1 (en) * | 2000-05-10 | 2004-06-01 | Siemens Automotive Corporation | Injection valve with single disc turbulence generation |
JP2002054533A (en) * | 2000-08-16 | 2002-02-20 | Unisia Jecs Corp | Fuel injection valve and method for manufacturing nozzle plate used in the fuel injection valve |
JP2002115628A (en) * | 2000-10-10 | 2002-04-19 | Nippon Soken Inc | Fuel injection valve and internal combustion engine |
JP3837283B2 (en) * | 2000-10-24 | 2006-10-25 | 株式会社ケーヒン | Fuel injection valve |
DE10118273A1 (en) * | 2001-04-12 | 2002-10-17 | Bosch Gmbh Robert | Fuel injection valve has atomizer disk with first upstream position for central inflow and radial outward apertures |
DE10124748A1 (en) * | 2001-05-21 | 2003-02-27 | Bosch Gmbh Robert | Fuel injector |
US6817545B2 (en) * | 2002-01-09 | 2004-11-16 | Visteon Global Technologies, Inc. | Fuel injector nozzle assembly |
US6789754B2 (en) * | 2002-09-25 | 2004-09-14 | Siemens Vdo Automotive Corporation | Spray pattern control with angular orientation in fuel injector and method |
JP4192179B2 (en) * | 2003-01-09 | 2008-12-03 | シーメンス ヴィディーオー オートモティヴ コーポレイション | Control of spray pattern by non-beveled orifice formed on raised fuel injection metering disk with sac volume reduction means |
WO2005061878A2 (en) * | 2003-12-19 | 2005-07-07 | Siemens Vdo Automotive Corporation | Polymeric bodied fuel injectors and method of manufacturing the polymeric bodied fuel injectors |
US7048202B2 (en) * | 2004-03-04 | 2006-05-23 | Siemens Vdo Automotive Corporation | Compound-angled orifices in fuel injection metering disc |
-
2004
- 2004-10-09 DE DE102004049281A patent/DE102004049281A1/en not_active Withdrawn
-
2005
- 2005-09-20 CN CNB2005800344732A patent/CN100572794C/en not_active Expired - Fee Related
- 2005-09-20 JP JP2007535134A patent/JP2008516135A/en active Pending
- 2005-09-20 EP EP05804894A patent/EP1799997B1/en not_active Expired - Fee Related
- 2005-09-20 DE DE502005008556T patent/DE502005008556D1/en active Active
- 2005-09-20 US US11/664,633 patent/US20090032623A1/en not_active Abandoned
- 2005-09-20 WO PCT/EP2005/054695 patent/WO2006040244A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2006040244A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2006040244A1 (en) | 2006-04-20 |
CN101040116A (en) | 2007-09-19 |
US20090032623A1 (en) | 2009-02-05 |
EP1799997B1 (en) | 2009-11-18 |
CN100572794C (en) | 2009-12-23 |
DE502005008556D1 (en) | 2009-12-31 |
DE102004049281A1 (en) | 2006-04-20 |
JP2008516135A (en) | 2008-05-15 |
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